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Finding the Fourth Proportional to 2,156.40, 3,234.60 and 696.56

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Solution

The fourth proportional to 2,156.40, 3,234.60 and 696.56 is: 1,044.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,156.40 : 3,234.60 = 696.56 : x
  2. Step 2: Convert to fraction form
    2,156.40/3,234.60 = 696.56/x
  3. Step 3: Cross multiply
    2,156.40x = 3,234.60 × 696.56
  4. Step 4: Simplify right side
    2,156.40x = 2,253,076.80
  5. Step 5: Solve for x
    x = 2,253,076.80/2,156.40
  6. Step 6: Final answer
    x = 1,044.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.